The thread is always cut everytime while sewing

Probably due to incorrect threading or else one of the needles are bent. I had the same problem and it was the threading and the tension.frustrating as all get out.

If thread is breaking at the needle, change the needle. It could be damaged and snagging the thread. However, if there is a burr in the needle plate, that could be catching and breaking the thread. Try different thread. Be sure to ALWAYS RAISE the presser foot when threading. Verify the thread path is correct and that each thread is seated completely in the tension disk. The tension may be too tight.

How old is the thread? Old thread can lose its elasticity over time and dry out making it weak. Also, the thread should match the needle and the fabric or there may be tension or breakage. And try changing the needle...the smallest burr ( you may not see it) can fray and cut the thread as you sew. Make sure the bobbin thread and sewing thread match...two different thread don't always get along.

Be sure to install a brand new needle of the type suitable for the fabric you are sewing.
All About Needles

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiJuN_Np6bMAhVJKWMKHSGmDvAQFggjMAE&url=http%3A%2F%2Fwww.schmetzneedles.com%2Flearning%2Fpdf%2Fschmetz-needle-chart.pdf&usg=AFQjCNHTR52AmqwzvyCjbXmD5Ch52Va5_Q

Use a thread that is suitable for the fabric. If you are sewing fine, light-weight fabric, use a fine thread--avoid old or bargain bin thread. Use the same upper thread in the bobbin.

When threading, always raise the presser foot so the thread will seat properly in the thread tension and verify that the thread path is correct (consult the manual).

Standard tension is usually the midway point between high & low number. The stitch length could be set a little higher than a 2--maybe a 2.25 or 2.5 for light fabric.

Since you are sewing fine fabric, it sometimes helps to use a removable stabilizer to give the fabric some extra body while stitching--perhaps a wash-away stabilizer if the fabric is washable.

Test your machine on scraps of the fabric you will be sewing. Re-adjust the tension as needed. The correct tension is when both upper and bobbin threads meet in the middle of the fabric.

If the thread continues to break, then there could be a burr or nick somewhere that is catching the thread and causing it to break. Could also be a needle/hook timing issue.

...

I try not to pull the threads when removing my fabric from the serger. Instead when the fabric has cleared the needles, continue to sew a chain of about 5-6 inches, then simply cut it with scissors leaving part of the chain attached to the fabric and the rest of the chain attached to the machine.

The bobbin thread must go through the bobbin tension guide before it can be picked up to the bed of the machine by the needle thread. There must be a mistake in threading the upper thread or the bobbin thread, or both. There are lots of manuals for sewing machines online and plenty of sewers who can help you in the area where you live. It's not a big problem just go to the nearest sewing store in your area and you'll get lots of help.

Likely your upper thread tension is too light and/or the proper thread routing is not right on the machine. Your bobbin might also be wound backwards.

Is the bobbin winder on? If so, turn it off.
Otherwise, is there power to the machine?
And this happened while you were sewing? Cut the thread above the needle eye. Rock the handwheel back and forth firmly to try to cut the thread jam below the needle plate with the sewing hook. If that doesn't work, open the bobbin case area of the machine and try to pull the bobbin case out, cutting any threads you can see with a seam ripper. Still won't come? Take the needle out of the needle clamp and throw it away (it's bent!), and take the screws out of the needle plate (=throat plate) and take the needle plate off after cutting any threads you can reach under the fabric. Keep cutting and pulling out any thread you find, and eventually, you'll be able to turn the handwheel. Clean all the thread bits, lint, and junk out of the area under the needle plate, the bobbin and bobbin case, and the shuttle area... there will be directions in your manual on how to clean the machine, including the shuttle area. Reassemble. Put in a brand new needle, right way around and fully up in the needle clamp. Rethread from scratch.
Always hold the thread ends behind the presser foot for the first couple of stitches of each seam.

See also: http://www.picturetrail.com/sfx/album/view/22521551

Hello

The feed dogs should be in the highest position for regular sewing. If the feed dogs are not raised above the plate it will do this. With the machine unthreaded and no fabric.. run the machine to see if the feed dogs are moving and are working.

.Always make sure you have about 3 inches of both threads before taking any stitches, and both threads are positioned directly behind the needle.

make sure you re-thread it exactly as the owners manual shows.

Change the needle

Change the thread

Take it in for servicing